Some Yong Heng numbers

Good post, and thanks for info that’ll help others shopping for a compressor.

I also have a Yong heng. Idk why many people who never used one always say it's cheap Chinese junk. It gets the job done at a affordable price. What's not to love about it. If it ever gets broke. You're only down $200-300. And parts are cheap and easy fix. Idk people who spend thousands will defend their compressor saying it is breathable dry air. But this is pcp, not suba diving. So dont need 3-4k on a breathable compressor when a $200-300 compressor can do the same job. Fills your guns and tanks.

"ducted fan blowing laterally on the cylinders." Hello BangG by "cylinders" you mean?.

thanks for the info.

Good deal & Great thread! 
You did so much better than I did when it came to recording the fill data! Nicely done! 

When I initially got my YH compressor, the intent was to fill & keep topping off an 88cf CF tank.. 
That's exactly what I did, and I continue to do so - Flawlessly.

These were the initial #s from last year filling the tank from zero to 300 bar. Try not to laugh: 



After 6 months, and again after 1 year, 
I ran the tank down to zero psi, disassembled, and inspected the interior..
Both times I got the same results: A bit of an interesting odor but no oil or moisture.

I still find that hard to believe, since I'm still only using the crappy OEM oil/water filter! 
[I have a nice large desiccant style filtration setup - still brand now - just sitting here]
I've moved two times, so never got the chance [or want] to sit down and install it all.
*Knocks On Wood* for such good luck with it all so far.

Anyways, I also used the YH to fill 2 other large metal SCBA tanks [for someone else]
and I acquired a large metal SCBA tank that I've completely filled and been topping off..
Lastly, it's been used to fill smaller metal and carbon fiber tanks - used on bottle-guns.

In the year + that the YH has been in use - The following is all that I've done: 
I initially filled the block with Royal Purple 100% Synthetic Compressor Lubrication 
Then I inspected and replaced the crappy cotton cartridge filters. [maybe 5 so far]
Since the initial oil-fill, I have only needed to give the comp ONE coil change.
When doing so, I used a coffee strainer and inspected the old oil for metal particulates.. 
Barely any, and those that were in there were tiny and IMO insignificant. 

I have two brand new rifles sitting here that both have issues right outa' the box.. 
Air leaking from full to empty and non responsive reg and/or reg gauge problems.
Needless to say, I've wasted a ridiculous amount of air trying to get them figured out and fixed.. 
So much air that I dropped the PSI on my 88cf CF tank down to like 170ish bar.. 
So - It was time for another serious top up. Roughly under 2k psi back up to 300bar.
I ran the comp for just under 23 minutes to achieve that. 
10 min in, I purged for oil/water, and at the end roughly 20ish min in, I purged again..
The first purge yielded a tiny mist of moisture. The second purge didn't show signs of anything.

I took a crappy phone vid clip of the last 2 minutes of that process 
[to show someone how the YH's manual set / auto shut off system works]
Details are in the description but in short.. 
72*F in the house and the hottest the YH temp rose to was just over 130*F [That's like 55* C]

https://www.youtube.com/watch?v=B8Yoc1qP4Ko

My thoughts as of right now.. These YH comps are killer - cost to functionality/performance
and as stated over and over again my myself and others.. They're only a few hundred bucks.

Going the YH route compared to getting the 'high end comp' that I was initially looking at 
has literally saved me right around $1,500.00
A year+ later, I still have endless air, and that 'saved money' just paid for an FX Dream Tac Compact!



Sam -

Good post. My YH has been going strong for 2+ years. I only direct fill to my 5 PCPs. All 5 are regulated 4 I have had apart several times for reg adjustment, never a hint of moisture. Also I installed a power plenum on my 3 month old Dreamlite last week no moisture there either. I think the key to dry air on the YH is to purge often. Well designed condensation towers, which the YH has, removes 99.3 of water (and oil) from the air. Filters any filter is designed to remove only minute amounts of the remaining water. See Link. Edit dirtydovi I didn't see your post before I posted, good stuf.

I agree completely with ImpactX why not own one, or two for that matter? And yes "cylinders" is correct. https://www.scubaengineer.com/high_pressure_compressor_filtrat.htm

Most of us that have the YH compressors have had pretty good luck with them. Although I am at 50/50 my second one lasted less than three hours of run time before the second stage piston werqed loose and destroyed itself banging on the head. No locktight from the factory! Bad factory werqers evil. The new piston was $12 and easy to install but had to be shaved a couple of thousandths as it hit on the head from the very beginning. Bad factory werqers evil! So these things aren't perfect. But YH #2 has run great from that point on and tops off my tanks and fills my guns quite quickly. I have two years and over 20 hours of run time on YH #1 it has blown a couple of o-rings and that's it even though I treated it poorly and overheated it severely several times. Now it is just sits there quietly waiting to be put back in service.

You are purging the water just often enough to keep it out of the system. I put on a gold three stage filter after the tiny YH filter and because I purge the compressor and change the YH filter regularly like you I have not had to change the large filter.